Sparking plug.



Patented July 254 1915;

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EB ILz tux, or LUDWIGsHAFEN-oN-THE-RHINE, GERMANY.

S/PA-RKING PLUG.

speeification of Letters Patent.

Patented July 27, 1915.

Application filed January 13, 191i; Serial No. 602,501.

To all whom itmcy co ncem;

"Be' iii/known that I, FRITZ Ltx a subject of the-King of Bavaria, inthe German Empire, and a resident of Ludwigshafen-on- 'the-Rh1ne,-K1ngdom of Bavaria, Germany,

hai've, invented certain new and useful Iniprovements Relating to Sparking Plugshof .which the following'is a specification.

\ -This invention relates to a novel method of arranging spark gaps such as are used for the ignition plugs of internal combustion engines and similar purposes. Inthe spark gaps of ignition plugs and 'the like, failure of the spark is frequently caused by the presence of oil between the electrodes or' other reasons, whereby the resistance of the gap is considerably increased, Itwilh -be' understood .that the sure and regular working of the ignition plug is. of special importance in the case of internal cbmbustion engines for use in aeroplanesand airships.

or the purpose of diminishingthe ob jections present in known formsrof ignition L plugs and for obtaining sure operation, the spark gap of the ignition plug is, according to the present invention, subjected to an matio view showing one method ofionizing the spark gap by means of a branched wire.

Fig. 2 shows a sparking. plug constructed .on the principle illustrated diagrammatically in Fig. 1. Fig. 3 shows a diagramfof another form of carrying out the invention in which'a condenser is employed.

In carrying the invention. into efiect ac- 1 cording to the form shown in Fig. llead's c c are connected tothe .source "of current a, and to the electrodes of the sparking plug 6, 6 A branch wire (Z, leads from the wirec, to the spark gap between the electrodes.

powerful sparks may be passedwith surety even in cases where the resistance between the electrodes 'is considerably greater than in ordinary sparking plu'gs.

the ignition of the mixture in the engineis -much-hetter and more thorough, and this of course leads to increased efliciency in the Experiments have shown that means of this arrangement the resistance of the gap is considerably reduced so that In this way I engine. The branch wire may lead from the immediate neighborhood of the spark gap, it may for instance be arranged in a groove in one of the electrodes. This is the method employed in the construction of sparking plug shown in Fig. 2. In this .form of sparking plug oneof the electrodes h,-is in theforin of a. metal rod. A metallic 'heajd is ar-ranged by means of a screw bolt 2' on a metal rod 10, which is supported in a.

porcelain tube m, which is in turn supported in a porcelain sleeve m The end of the rod 70 remote from the metallic head 6,-

projects through the bottom of the porcelain sleeve m and this projecting end is provided with a thread 70 and a collar if, so that it may be bound to the porcelain sleeve 07? bymeans of a nut 76 A milled nut 70? is provided forv fixing the rod is, and electrode i, .to one pole of an inductor which is T not illustrated. The electrode It iscarried by a metallic body n, in a manner shown in the'drawing. This body has at its end a thread n .for co'nnectingrit to the porcelain sleeve m by means of the sleeve nut if. A screw thread n isproVided forenabling the entire sparking plug to be screwed into the casingof a motorcylinder which. casing provides the conduit to the other pole ofthe conductor. The electrode h, is pro vided at the point where the spark passes with, a sharp. pointed or edged disk 72 so that oil may freely drop therefrom.

* 'According to the invention a hollow i is provided in the metal head i, and a branch is formed by a metallic needle. ;0, which is held in the hollow 71 by means of a metallic cylinder i It is by means of this branch that the ionization of the spark takes place.

The method of operation of this device will be clear without further explanation.

"The spark gap is arranged betweenthe part-b and the neighboring edge of the metal head i.

The ionization is produced by a silent- L discharge, that takes place between the electrodes g0 and it, whereas the main spark jumps between the electrodes 2' and k According to the form shown in Fig. 3,

a condenser is arranged in the branch wire.

The invention may also be applied to other devices than ignition plugs in which itisdesircd to diminish the resistance in a spark gap..

Having now particularly described and ascertained the nature of my said invention 1. In a s ark plug, a ground electrode, a second elec rode 113N111 a point adjacent the gap,-the di'stance of the branch terminal from said ground electrode being greater thancthat of the main terminal, said branch terminal being, of a more pointed shape than the main terminal.

2. An improved sparking plug comprisingin combination a metal rod (klserving as one electrode, a metallic body (n) carryin'g thefsaid rod (k), a second rod (70') a' main terminal, arranged to form a ga'p virith said ground" electrode and insulated therefrom, a branch 'porcelain sleeve on, supporting said terminal leading from the main terminal to' means for attaching the rod 70 to the said 25 pression 2?, a needle p thus arranged in said 20 depression' opppsite to the said Pro'd k, the

distance of the needle p, from the -electrode k? being greater than that of the head 21 a rod 7:,

porcelain sleeve m and means for fixing the latter to the metallic body 1.

In Witness whereof I have hereunto set my hand in the presence of two witnesses.

, FRITZ LUX. I

-Witnesses:

GEORG FRITZ BERG, A. O. Tnmumm' 

